There are loads of places what you need to do is have a look behind you engine and you will see loads of rubber gromits by you passenger side into you car. Some may have cables already going through them. Make a SMALL hole through one of these ones with out any other cables, then slide the cable through it the hole will stretch giving you a water tightish hole. In side you car you will need to remove the shelf below your glove box and pull the carpet away. With the gromit removed you should be able to see daylight if not try another one until you have success. But dont drill any holes there is no need to.
